Time for Changes in Oil Production

Content

R7 - The electro-hydraulic downhole pump drive

Description of functions

The electro-hydraulic downhole pump drive R7 from Rexroth is built up of a hydraulic cylinder mounted directly on the well head tubing and a hydraulic power unit (HPU). The HPU consists of an axial piston unit (A), e-motor (E) with integrated flywheel (S) and system control (AS). The upward and downward movement of the downhole pump produces the crude oil from the well. The drive system is CE-approved and meets the safety requirements of the machinery directive 2006/42/EC. The cylinder and the mounting frame are in compliance with Atec equipment directive 94/9/EC.

Technical information of running R7 system at Wintershall in Landau/Germany

Stroke of 1,900 mm

Dynamic force of 67 kN

Nodding pump in 1500 m depth

Increased efficiency through individual cycle time adjustment

The R7 equipment operates independently from the sinusoidal v/t function. The maximum lifting speed is not limited by the maximum lowering speed. Simple individual adjustments of the cycle times are possible, as well as fast optimization of cylinder stroke to the production conditions of the well.

Increased efficiency through condition monitoring

The efficiency of the crude oil downhole pump drive is determined by the evaluation of a dynagram. The current motion sequence can be saved within the R7 system control, and the dynogram showed on the installed screen can be directly imported into an Excel table. This function allows the immediate overview and optimization of various settings of the R7 unit.

Increased efficiency through overload protection

Continuous monitoring and limiting of the cylinder force prevents an overload or a break of the sucker rods. In the event of too much resistance in the drill hole, the drive does not switch off but starts a creep speed movement in the opposite direction. This results in reduced downtimes of the equipment.

Simple installation and fast start-up

Due to the low weight and the low space requirements, the transport and the installation of the R7 equipment can be executed quickly and with minimal effort.